Final answer:
The alcohol CH3CH(OH)CH2CH3 is a primary alcohol because the carbon with the OH group is attached to only one other carbon atom.
Step-by-step explanation:
To classify the alcohol CH3CH(OH)CH2CH3 as primary, secondary, or tertiary, we need to look at the number of carbon atoms attached to the carbon holding the hydroxyl (OH) group. In this case, the OH group is attached to a carbon atom that is connected to only one other carbon atom. Therefore, it is a primary alcohol. Primary alcohols typically oxidize to form an aldehyde, and further oxidation will yield a carboxylic acid.